You've certainly tackled a difficult subject, but one that is definitely worth some discussion.

Given the section you've put this in, I'm assuming that you meant this to me of a poem than prose. Right now, it reads more like emotional non-fiction prose than poetry. If you want to make it a poetry piece, I'm going to suggest some line breaks within your sentence structure. For example,It is a monster that lies within the depths of our mind and it eats away at our happiness and dreams.

could be broken apart as It is a monsterthat lies within the depthsof our mindand it eats away at our happinessand dreams.

Formatting it that way gives the reader more time to pause at the moments you want them to notice, such as putting emphasis on the fact that it's a monster, and that it eats away at you inside.

There are also a few places that you might want to make some small edits.darkness from which we cannot outrun - I would suggest eliminating "from" as it makes the phrase awkward. The sentence this phrase is in is also a run on. In order to offset that, because artistically it can certainly work for you, I would add a dash between "us" and "and".

I like the words you've used to discuss the issue, and I do think that you've managed to bring up a perspective that is far too often ignored. Thank you for sharing your thoughts.